Hi, Thunderbug,
We had a lot of cases like this in my homecountry, in my yard. The advice we got was to leave the bird where it is, as this is where its mother can find it and feed it. Do you have a place in your yard where the bird would be protected and where its mother could see it? It will not eat the raw oats you gave. Maybe try to cook the oats, so its mother can feed it. Make sure it has water and shade.
Do not try to teach it how to fly under any circumstances, as someone suggested above.
You can try to google the numbers for vets, but I don't know how much they'll be able to help.